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• Pond C <br />Pond C Emergency Spillway <br /> Mannings Equation <br /> Flow In a Trapezoidal Channel <br /> DEPTH D 0.750 FEET <br /> WIDTH W 10.000 FEET <br /> Slope S 0.020 EXPRESS AS DECIMAL <br /> Mannings "N" N 0.030 EXPRESS AS DECIMAL <br /> SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W'D)+(X*D^2)= 8.63 FEET^2 <br />WETTED PERIMETER=(W)+2'[((X'Dr2+D^2)^0.5] 13.35 FEET <br />R=AREA/WETTED PERIMETER 0.65 <br />V=(1.49/N)*(R^.667)'(S^.5)= 5.25 FT/SEC <br />Q = A X V = 45.27 CFS <br />Q REQUIRED -Peak Discharge 40.19 CFS <br />Riprap Sizing -Across top of Embankment - Pontl C <br />D50 =Size of Riprap <br />D50 = ((V X S^.17)/7.56}}^z <br />D50 = Diameter in feet <br />V =Velocity <br />S =Slope <br />D50 = 0.13 feel 1.5 inches None Required <br />Determine flow velocity down 3h:1v embankment -Pond C <br />Pond C Emergency Spillway <br />Mannings Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.400 FEET <br />WIDTH W 10.000 FEET <br />Slope S 0.330 EXPRESS AS DECIMAL <br />Mannings "N" N 0.040 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W*D)+(X*D^2)= 4.32 FEET^2 <br />WETTED PERIMETER=(W)+2*[(( X*D)^2+D^2)^0. 5] 11.79 FEET <br />R=AREA/WETTED PERIMETER 0.37 <br />V=(1.49/N)*(R^.667)*(S^.5)= 10.96 FT/SEC <br />C=R YL~= -4?.34 CF3 <br />Q REQUIRED -Peak Discharge 40.19 CFS <br />PR-07 - EXH-8 -9 <br />2/03 <br />